So are you saying you cant get an erection like min after cumming the first time?
The sperm production dont really have anything to do with an erection, it's the blood circulation to the penis. How do you think men who have had vesectomys reach orgasm when they dont have sperm. There is also fluids that come from the seminal vesicle, and the prostate glads that do not contain sperm, they contain fluids thats what gives the cum the white translucent fluid.
Don't worry about not being able to become erect again like 2min later. Sometimes it can take my bf like an hour before he can get up and go again. If its your girl that wants to keep on gonig, perform oral sex on her.Or if you want to keep on gonig longer use a penis ring they help keep the blood in the penis.